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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - simple-loop-unswitch crashes: Assertion `L.isRecursivelyLCSSAForm(DT, LI) && "Loops must be in LCSSA form before unswitching."' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=43474">43474</a>
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<tr>
<th>Summary</th>
<td>simple-loop-unswitch crashes: Assertion `L.isRecursivelyLCSSAForm(DT, LI) && "Loops must be in LCSSA form before unswitching."' failed.
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>cszide@163.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22586" name="attach_22586" title="bugpoint-reduced-simplified.bc">attachment 22586</a> <a href="attachment.cgi?id=22586&action=edit" title="bugpoint-reduced-simplified.bc">[details]</a></span>
bugpoint-reduced-simplified.bc
$clang -v
clang version 10.0.0 (trunk 372974)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$opt bugpoint-reduced-simplified.bc -loop-interchange -simple-loop-unswitch
WARNING: You're attempting to print out a bitcode file.
This is inadvisable as it may cause display problems. If
you REALLY want to taste LLVM bitcode first-hand, you
can force output with the `-f' option.
opt:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp:2802:
bool unswitchLoop(llvm::Loop&, llvm::DominatorTree&, llvm::LoopInfo&,
llvm::AssumptionCache&, llvm::TargetTransformInfo&, bool,
llvm::function_ref<void(bool, llvm::ArrayRef<llvm::Loop*>)>,
llvm::ScalarEvolution*, llvm::MemorySSAUpdater*): Assertion
`L.isRecursivelyLCSSAForm(DT, LI) && "Loops must be in LCSSA form before
unswitching."' failed.
Stack dump:
0. Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt
bugpoint-reduced-simplified.bc -loop-interchange -simple-loop-unswitch
1. Running pass 'Function Pass Manager' on module
'bugpoint-reduced-simplified.bc'.
2. Running pass 'Loop Pass Manager' on function '@main'
3. Running pass 'Simple unswitch loops' on basic block '%._crit_edge147'
#0 0x000055c1d1f86baa llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2783baa)
#1 0x000055c1d1f84884 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2781884)
#2 0x000055c1d1f849c2 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x27819c2)
#3 0x00007fe3ecd1c890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
#4 0x00007fe3eb9cee97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
#5 0x00007fe3eb9d0801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
#6 0x00007fe3eb9c039a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
#7 0x00007fe3eb9c0412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
#8 0x000055c1d1e88856 (anonymous
namespace)::SimpleLoopUnswitchLegacyPass::runOnLoop(llvm::Loop*,
llvm::LPPassManager&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2685856)
#9 0x000055c1d125762b llvm::LPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1a5462b)
#10 0x000055c1d18c5209 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20c2209)
#11 0x000055c1d18c5301 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20c2301)
#12 0x000055c1d18c4461 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20c1461)
#13 0x000055c1d0094b4f main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x891b4f)
#14 0x00007fe3eb9b1b97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#15 0x000055c1d010cc7a _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x909c7a)
Aborted (core dumped)</pre>
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